单项选择题

Which of the following does NOT show the process of evolution of leapfrog technology

A． from fixed line network to mobile phone
B． from light-emitting diodes to incandescent light bulbs
C． from centralized electric grids to green sources
D． from desktop computers to portable devices

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单项选择题

The first two paragraphs serve all of the following purposes EXCEPT to ______.

A． provide a narrative account to serve as an introduction
B． contrast American Indian social events with individual performances
C． create a sense of the permanence of some American Indian customs
D． inform the reader about the nature of a powwow

单项选择题

Why did the author mention Senator John McCain and Ted Kennedy in Paragraph 6

A． Because they initiated legislation to find a solution to the problem of immigration.
B． Because they are political foes but find common voice for immigrants.
C． Because they are influential people in American politics.
D． Because they hold opposing views on the issue of immigration.

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